Perma Sharp is my favorite blade. I bought a 100 pack of them about a year ago from Amazon, and I was winding down on that so I reordered from Amazon.
The old blade and package is on the left and the new version is on the right. The new version is totally unmarked on both sides of the blade, which I can't recall ever seeing on any blade.
Edit: here's the listing I bought the blades from:
https://www.amazon.com/gp/product/B009BS5CUA/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1
The blades are totally different in packaging and appearance. Did they change this much, or did I get the wrong blades? The seller's picture in the listing was exactly like the old version.